Customers reported having booked hotels and apartments last year, only for the emails to arrive this week informing them that their reservations have been cancelled.

Atletico Madrid fan Miguel Angel Peris was one of the unlucky supporters, estimated to be among the hundreds, to receive a heartbreaking (and potentially bank-breaking) email:

“I’ve had a hotel reserved in Milan with Booking.com since January for €110, and they’ve cancelled on me without explanation,” he said.

“Now it's €600! How shameless.”

Long live Madrid! The Champions League final will be an all-Madrid affair

Other fans have received emails blaming “technical reasons” while the focus of complaints has been widened to airlines, who have ramped up prices of Madrid routes to Milan, and UEFA themselves.

European football’s governing body have enraged the Spanish sports media by offering each club just 20,000 tickets to the biggest game of the season.

Over half of the San Siro’s 81,227 capacity will be filled with corporate supporters.

MirrorFootball have contacted Booking.com over the matter, with a spokesperson from the company saying that they do not sell or re-sell rooms, but rather facilitates the reservation process between customers and accommoadations.

In a statement they said:

"At Booking.com, because our customers are at the centre of everything we do, we make it our absolute priority to fix any issues as quickly as possible. When a customer makes a booking via Booking.com, their booking confirmation does serve as an agreement between that customer and the property they have booked. Per the hotels agreements with Booking.com, after the reservation is made there are only a small set of conditions which mean the hotel is able to cancel, such as if there are specific credit card guarantee issues.

"In very rare cases when an issue arises, we immediately step in to investigate and try to find a satisfactory resolution for all parties involved. This is exactly what we are doing now. Regardless of the issue, our goal is always to resolve it quickly and satisfactorily for our customers so that they can get back to planning or enjoying their travel as soon as possible. Also, if our customers are ever in any doubt with regards to any aspect of a booking they have made via Booking.com, especially when it comes to changes to their reservation, they should immediately contact our Customer Service team. They are on hand 24/7 to help, support and advocate for our customers in their preferred language."